id:A115648 - OEIS Search Results

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Square numbers which are the sum of distinct double factorials (A006882).

+0
3

1, 4, 9, 16, 25, 49, 64, 121, 169, 400, 441, 961, 1444, 3844, 3969, 4225, 4356, 4900, 5184, 10404, 11449, 11881, 14400, 15625, 47089, 47524, 56644, 57600, 139129, 145924, 149769, 182329, 192721, 695556, 705600, 792100, 837225, 2073600 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Double factorials 0!! and 1!! are not considered distinct. Note that double factorial (n!!) is different from (n!)!.`
	EXAMPLE	`10404 = 102^2 = 1!! + 4!! + 11!!.`
	CROSSREFS	`Cf. A006882, A115649, A115650, A115651, A025494.` `Sequence in context: A063735 A056798 A036454 this_sequence A082522 A133900 A143480` `Adjacent sequences: A115645 A115646 A115647 this_sequence A115649 A115650 A115651`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 28 2006`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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